Greetings.
I have a few tables that I am bringing data from, but I found a bug in my
logic, which I am trying to see if I can make it work. Please look at this
scenario
create table t (n INTEGER PRIMARY KEY, a, b, c, d, e, idate);
insert into t (a, b, c, d, e, idate) values ('p001', 'a', 1, 'n', 4,
'2019-02-11');
insert into t (a, b, c, d, e, idate) values ('p002', 'a', 1, 'n', 4,
'2019-02-11');
insert into t (a, b, c, d, e, idate) values ('p003', 'a', 2, 'n', 4,
'2019-02-11');
insert into t (a, b, c, d, e, idate) values ('p004', 'a', 2, 'y', 4,
'2019-02-11');
insert into t (a, b, c, d, e, idate) values ('p005', 'a', 3, 'y', 4,
'2019-02-11');
insert into t (a, b, c, d, e, idate) values ('p001', 'a', 4, 'n', 4,
'2019-02-12');
insert into t (a, b, c, d, e, idate) values ('p002', 'a', 5, 'n', 4,
'2019-02-12');
insert into t (a, b, c, d, e, idate) values ('p003', 'a', 6, 'n', 4,
'2019-02-12');
insert into t (a, b, c, d, e, idate) values ('p004', 'a', 7, 'y', 4,
'2019-02-12');
insert into t (a, b, c, d, e, idate) values ('p005', 'a', 8, 'y', 4,
'2019-02-12');
insert into t (a, b, c, d, e, idate) values ('p001', 'a', 3, 'n', 4,
'2019-02-13');
insert into t (a, b, c, d, e, idate) values ('p002', 'a', 4, 'n', 4,
'2019-02-13');
insert into t (a, b, c, d, e, idate) values ('p003', 'a', 5, 'n', 4,
'2019-02-13');
insert into t (a, b, c, d, e, idate) values ('p004', 'a', 6, 'y', 4,
'2019-02-13');
insert into t (a, b, c, d, e, idate) values ('p005', 'a', 7, 'y', 4,
'2019-02-13');
select * from t;
create table z (n INTEGER PRIMARY KEY, f, g, h, i, j, idate);
insert into z (f, g, h, i, j, idate) values ('p001', 'b', 6, 'o', 4,
'2019-02-15');
insert into z (f, g, h, i, j, idate) values ('p002', 'b', 6, 'o', 4,
'2019-02-15');
insert into z (f, g, h, i, j, idate) values ('p003', 'b', 6, 'i', 4,
'2019-02-15');
insert into z (f, g, h, i, j, idate) values ('p004', 'a', 9, 'i', 4,
'2019-02-16');
insert into z (f, g, h, i, j, idate) values ('p005', 'a', 8, 'u', 4,
'2019-02-16');
insert into z (f, g, h, i, j, idate) values ('p001', 'a', 8, 'u', 4,
'2019-02-17');
insert into z (f, g, h, i, j, idate) values ('p002', 'a', 5, 'e', 4,
'2019-02-17');
insert into z (f, g, h, i, j, idate) values ('p003', 'a', 7, 'e', 4,
'2019-02-17');
insert into z (f, g, h, i, j, idate) values ('p004', 'a', 7, 'b', 4,
'2019-02-17');
insert into z (f, g, h, i, j, idate) values ('p005', 'a', 3, 'b', 4,
'2019-02-18');
insert into z (f, g, h, i, j, idate) values ('p001', 'a', 3, 'a', 4,
'2019-02-18');
insert into z (f, g, h, i, j, idate) values ('p002', 'a', 3, 'a', 4,
'2019-02-18');
insert into z (f, g, h, i, j, idate) values ('p003', 'a', 5, 'a', 4,
'2019-02-18');
insert into z (f, g, h, i, j, idate) values ('p004', 'a', 6, 'o', 4,
'2019-02-18');
insert into z (f, g, h, i, j, idate) values ('p005', 'a', 7, 'o', 4,
'2019-02-18');
select * from z;
I can do this,
select
a.*, b.* from t as a join z as b on a.a = b.f
where a.a = 'p001'
AND
a.idate = (select max(idate) from t where a = a.a)
AND
b.idate = (select max(idate) from z where f = a.a)
ORDER BY a.a
;
and get the correct output,
11|p001|a|3|n|4|2019-02-13|11|p001|a|3|a|4|2019-02-18
without any problem. But, when I do this,
insert into t (a, b, c, d, e, idate) values ('p006', 'e', 8, 'n', 5,
'2019-03-01');
and then do this,
select
a.*, b.* from t as a join z as b on a.a = b.f
where a.a = 'p006'
AND
a.idate = (select max(idate) from t where a = a.a)
AND
b.idate = (select max(idate) from z where f = a.a)
ORDER BY a.a
;
I get nothing. I know why, but what will save my logic is, to be able to fix
the query above and get something like this,
16|p006|e|8|n|5|2019-03-01|||||||
in other words, NULL values instead. This will fix my "logic". :-) and the
world will be at peace again. :-) Is this even possible? Thanks.
josé
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